Energizer, 4 Pack, "AA", Advanced Lithium Battery, Provides A Clear Price To Performance Value For Tech-Driven Devices, Performance Up To 6 Times Longer In Digital Cameras, Lasts Up To 30% Longer In MP3 & CD Players, Performs In Extreme Temperatures & Is 33% Lighter Than Ordinary Alkaline Batteries, Comparisons Based On Energizer Max Alkaline Batteries.